[igt-dev] [RFC] tools/dpcd_dump: Introduce DPCD dump on IGT.
Rodrigo Vivi
rodrigo.vivi at intel.com
Tue Aug 21 00:12:04 UTC 2018
The idea is to remove the dump from i915's debugfs, but
before we need to be able to keep the current debug dpcd list
and IGT seems a good place to have some flexibility.
FIXME: fffff trash...
Current debugfs:
$ sudo cat /sys/kernel/debug/dri/0/DP-1/i915_dpcd
0000: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 02
0070: 00 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100: 14 84 00 06 06 06 06 00 01 04 00
0200: 41 00 77 77 01 03 22 22
0600: 01
0700: 01
0701: 00 00 00 00
0720: 00 01 00 00 00 01 01 00 00 00 00 00 01 00 00 01
0732: 00 00
$ sudo cat /sys/kernel/debug/dri/0/eDP-1/i915_dpcd
0000: 12 14 84 40 00 00 01 01 02 00 00 00 00 0b 00
0070: 01 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100: 14 04 00 00 00 00 00 00 00 00 00
0200: 41 00 00 00 80 00 66 66
0600: 01
0700: 02
0701: 9f 40 00 00
0720: 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00
0732: 00 00
---------------------------------------------------------
Current dpcd_dump proposed here:
$ sudo ./build/tools/dpcd_dump
Dumping DPDDC-B
:
0000: 12 14 ffffffc4 01 01 00 01 00 02 02 06 00 00 00 02
0070: 00 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100: 14 ffffff84 00 06 06 06 06 00 01 04 00
0200: 41 00 77 77 01 03 22 22
0600: 01
0700: 01
0701: 00 00 00 00
0720: 00 01 00 00 00 01 01 00 00 00 00 00 01 00 00 01
0732: 00 00
DPCD DPDDC-C
seems not available. skipping...
Dumping DPDDC-A
:
0000: 12 14 ffffff84 40 00 00 01 01 02 00 00 00 00 0b 00
0070: 01 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100: 14 04 00 00 00 00 00 00 00 00 00
0200: 41 00 00 00 ffffff80 00 66 66
0600: 01
0700: 02
0701: ffffff9f 40 00 00
0720: 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00
0732: 00 00
Cc: Rafael Antognolli <rafael.antognolli at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
tools/Makefile.sources | 1 +
tools/dpcd_dump.c | 152 +++++++++++++++++++++++++++++++++++++++++
tools/meson.build | 1 +
3 files changed, 154 insertions(+)
create mode 100644 tools/dpcd_dump.c
diff --git a/tools/Makefile.sources b/tools/Makefile.sources
index abd23a0f..f4921f83 100644
--- a/tools/Makefile.sources
+++ b/tools/Makefile.sources
@@ -6,6 +6,7 @@ noinst_PROGRAMS = \
$(NULL)
tools_prog_lists = \
+ dpcd_dump \
igt_stats \
intel_audio_dump \
intel_reg \
diff --git a/tools/dpcd_dump.c b/tools/dpcd_dump.c
new file mode 100644
index 00000000..1b989e53
--- /dev/null
+++ b/tools/dpcd_dump.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <string.h>
+
+struct dpcd_block {
+ /* DPCD dump start address. */
+ unsigned int offset;
+ /* DPCD dump size. If unset, defaults to 1. */
+ size_t size;
+};
+
+static const struct dpcd_block dpcd_dump[] = {
+ /* DP_DPCD_REV */
+ { .offset = 0, .size = 15 },
+ /* DP_PSR_SUPPORT to DP_PSR_CAPS*/
+ { .offset = 0x70, .size = 2 },
+ /* DP_DOWNSTREAM_PORT_0 */
+ { .offset = 0x80, .size = 16 },
+ /* DP_LINK_BW_SET to DP_EDP_CONFIGURATION_SET */
+ { .offset = 0x100, .size = 11 },
+ /* DP_SINK_COUNT to DP_ADJUST_REQUEST_LANE2_3 */
+ { .offset = 0x200, .size = 8 },
+ /* DP_SET_POWER */
+ { .offset = 0x600 },
+ /* DP_EDP_DPCD_REV */
+ { .offset = 0x700 },
+ /* DP_EDP_GENERAL_CAP_1 to DP_EDP_GENERAL_CAP_3 */
+ { .offset = 0x701, .size = 4 },
+ /* DP_EDP_DISPLAY_CONTROL_REGISTER to DP_EDP_BACKLIGHT_FREQ_CAP_MAX_LSB */
+ { .offset = 0x720, .size = 16},
+ /* DP_EDP_DBC_MINIMUM_BRIGHTNESS_SET to DP_EDP_DBC_MAXIMUM_BRIGHTNESS_SET */
+ { .offset = 0x732, .size = 2 },
+};
+
+void dump_all(int fd)
+{
+ int ret, i, j, size;
+ char buf[32];
+
+ for (i = 0; i < sizeof(dpcd_dump) / sizeof(dpcd_dump[0]); i++) {
+ ret = lseek(fd, dpcd_dump[i].offset, SEEK_SET);
+ if (ret < 0) {
+ fprintf(stderr, "lseek to %04x failed!\n", dpcd_dump[i].offset);
+ return;
+ }
+
+ size = dpcd_dump[i].size ? dpcd_dump[i].size: 1;
+ printf("%04x: ", dpcd_dump[i].offset);
+ ret = read(fd, &buf, size);
+ if (ret < 0) {
+ fprintf(stderr, "read of %d bytes to %04x failed!\n", size, dpcd_dump[i].offset);
+ return;
+ }
+
+ for (j = 0; j < size; j++)
+ printf(" %02x", buf[j]);
+ printf("\n");
+ }
+}
+
+int main(int argc, char **argv)
+{
+ struct dirent *dirent;
+ DIR *dir;
+ char dev_path[PATH_MAX];
+ char sysfs_path[PATH_MAX];
+ int dev_fd, sysfs_fd, ret = 0;
+ char dpcd_name[8];
+ char discard;
+
+ dir = opendir("/sys/class/drm_dp_aux_dev/");
+ if (!dir) {
+ fprintf(stderr, "fail to read /dev\n");
+ return -1;
+ }
+
+ while ((dirent = readdir(dir))) {
+ if (strncmp(dirent->d_name, "drm_dp_aux", 10) == 0) {
+ sprintf(dev_path, "/dev/%s", dirent->d_name);
+ sprintf(sysfs_path, "/sys/class/drm_dp_aux_dev/%s/name",
+ dirent->d_name);
+
+ sysfs_fd = open(sysfs_path, O_RDONLY);
+ if (sysfs_fd < 0) {
+ fprintf(stderr,"fail to open %s\n", sysfs_path);
+ continue;
+ }
+
+ dev_fd = open(dev_path, O_RDONLY);
+ if (dev_fd < 0) {
+ fprintf(stderr,"fail to open %s\n", dev_path);
+ continue;
+ }
+
+ ret = read(sysfs_fd, &dpcd_name, sizeof(dpcd_name));
+ if (ret < 0) {
+ fprintf(stderr, "fail to read dpcd name from %s\n\n", sysfs_path);
+ continue;
+ }
+ dpcd_name[ret] = '\0';
+
+ /* Dummy read to check if dpcd is available */
+ ret = read(dev_fd, &discard, 1);
+ if (ret != 1) {
+ fprintf(stderr, "DPCD %s seems not available. skipping...\n", dpcd_name);
+ continue;
+ }
+
+ printf("Dumping %s:\n", dpcd_name);
+ dump_all(dev_fd);
+ printf("\n");
+
+
+
+ close(sysfs_fd);
+ close(dev_fd);
+ }
+ }
+
+ closedir(dir);
+
+ return 0;
+}
diff --git a/tools/meson.build b/tools/meson.build
index e4517d66..3326a5a7 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -14,6 +14,7 @@ endforeach
tools_progs = [
# FIXME we already have a libtestcase with this name as target
#'igt_stats',
+ 'dpcd_dump',
'intel_audio_dump',
'intel_backlight',
'intel_bios_dumper',
--
2.17.1
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